B737 MAX 8 crew reported the left wing anti ice failed and they landed with ice accumulation on the wing.
Synopsis
B737 MAX 8 crew reported the left wing anti ice failed and they landed with ice accumulation on the wing.
Narrative
Passing 10;000 ft. into ZZZ; both pilots noticed ice accumulation on the windshield wipers. The Captain then looked out his window and noticed a slight amount of ice on the left wing. He announced that he was turning on the Wing A/I. Upon further descent; somewhere between 8;000 ft. and 6;000 ft. the left-wing A/I light illuminated. We were being vectored for final but still had time to open the QRH. The Captain ran the QRH as directed; and we complied with the final step to get out of the icing condition. ATC advised us that they had icing reported all the way down to 5;000 ft. and we asked to get below that. ATC then gave us a descent to 4;000 ft. where the ice accumulation abated. We flew the rest of the approach uneventfully and landed on Runway XXR. Once we got to the gate; the oncoming Captain began his walkaround. I met him in the jetway and advised him what happened and that my Captain had called maintenance and was writing up the Wing A/I System. That is when he notified me that there was significant ice on the left wing. I went to inspect the wing myself and noticed a significant; almost clear layer of ice on the middle of the left wing. The Captain completed the writeup and briefed the situation to maintenance. We turned the aircraft over to the outbound crew. We did not know we had a problem until the Wing A/I failed while we were in icing conditions. Other than getting out of the icing condition per the QRH; it would be nice to know if there was a reset or way to know if the valve had actually failed.
Second reporter narrative
While being vectored for an ILS approach; at 8;000 ft. we encountered moderate rime ice. At that point I turned on the wing anti-ice switch. Shortly after doing so; a Master Caution light illuminated; indicating a left valve issue. We ran the appropriate QRH Checklist and realized we indeed had a failure of that system. We notified ATC that we were encountering moderate rime ice and were told that no icing was reported below 5;000 ft. We descended to 4;000 ft. There was no further accumulation of ice below 5;000 ft. and we continued the approach and landed without any further incident. After this incident I was informed that this may be a possible known issue with the MAX 8. Wing anti-ice (left valve) failed to work.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.